--- title: Hackers exploiting Acrobat Reader zero-day flaw since... description: A zero-day vulnerability in Adobe Reader has been actively exploited since at least December 2025, discovered by security researcher Haifei Li. Attackers use... canonical: https://daily.dev/posts/hackers-exploiting-acrobat-reader-zero-day-flaw-since-december-3ltcakkht twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Hackers exploiting Acrobat Reader zero-day flaw since December | daily.dev og:description: A zero-day vulnerability in Adobe Reader has been actively exploited since at least December 2025, discovered by security researcher Haifei Li. Attackers use... og:url: https://daily.dev/posts/hackers-exploiting-acrobat-reader-zero-day-flaw-since-december-3ltcakkht og:image: https://api.daily.dev/og/posts/3ltcakKHt.png og:image:alt: Hackers exploiting Acrobat Reader zero-day flaw since December og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Hackers exploiting Acrobat Reader zero-day flaw since December **[BleepingComputer](https://daily.dev/sources/bleepingcomputer)** · 2 min read · 0 upvotes · 0 comments ## Summary A zero-day vulnerability in Adobe Reader has been actively exploited since at least December 2025, discovered by security researcher Haifei Li. Attackers use maliciously crafted PDF files with Russian-language lures referencing the Russian oil and gas industry. The exploit requires no user interaction beyond opening a PDF, enables data theft via privileged Acrobat APIs, and can facilitate subsequent remote code execution and sandbox escape attacks. Adobe has been notified but has not yet released a patch. Users are advised to avoid opening PDFs from untrusted sources, and network defenders can block HTTP/HTTPS traffic with 'Adobe Synchronizer' in the User-Agent header as a mitigation. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Adobe Chrome extension flaw let sites access private WhatsApp chats](https://daily.dev/posts/adobe-chrome-extension-flaw-let-sites-access-private-whatsapp-chats-fee9bvnnj) · BleepingComputer · 0 upvotes · 0 comments - [Critical jsPDF vulnerability enables arbitrary file read in Node.js deployments](https://daily.dev/posts/critical-jspdf-vulnerability-enables-arbitrary-file-read-in-node-js-deployments-zhc6utwik) · CSO Online · 0 upvotes · 0 comments - [Vulnerabilities in various GTK-based PDF readers](https://daily.dev/posts/vulnerabilities-in-various-gtk-based-pdf-readers-hb5qngvpa) · LWN.net · 0 upvotes · 0 comments --- Tags: [#zero-day](https://daily.dev/tags/zero-day) [View this post on daily.dev](https://daily.dev/posts/hackers-exploiting-acrobat-reader-zero-day-flaw-since-december-3ltcakkht) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Hackers exploiting Acrobat Reader zero-day flaw since December","url":"https://daily.dev/posts/hackers-exploiting-acrobat-reader-zero-day-flaw-since-december-3ltcakkht","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hackers-exploiting-acrobat-reader-zero-day-flaw-since-december-3ltcakkht"},"datePublished":"2026-04-09T09:23:12.560Z","dateModified":"2026-04-13T21:10:36.767Z","description":"A zero-day vulnerability in Adobe Reader has been actively exploited since at least December 2025, discovered by security researcher Haifei Li. 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